body {
    background-image: url(../img/background2.jpg);
    background-size: 100%;
    
    font-family: Arial,Helvetica,sans-serif;
    font-size: 20px;
    font-weight: bold;
    font-variant: inherit;
    color: black;
}

#centrar { 
    position: fixed;
    top: 50%;
    left: 60%;
    margin-top: -210px;
    margin-left: -320px;    
}
    